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Rain Bird three-quarter inch impacts

Huzzah, I'm still alive! :) Since I had to finally drag the portable PVC sprinkler line out from its resting place this evening, I figured I'd make a quick little video of some good old Rain Bird brass impacts in action. From the view at the very beginning of the video, at the far left is the 35A-PJ-TNT (part circle), in the middle is a 40B-TNT with the rear spreader port plugged, and the far right is a 14070-TNT, which has a 1/8"-20º spreader nozzle in the rear nozzle port. All three impacts have a 3/16" (ADJ-3) main nozzle with the adjustable spring-loaded diffuser screw. Not sure why that 40B likes to do that little double-tap with its drive arm, but for whatever reason it's always done that even though it works and waters perfectly fine otherwise.